Records stored at the records center which become eligible for destruction shall be destroyed by the archivist in accordance with approved records schedules. The archivist shall notify the depositing agency of the intention to destroy the records at least 30 days prior to their intended destruction. Upon request of the agency, stating justification for continued retention of the records, and with the approval of the archivist, these records may be held for an additional period of time. Ordinarily, agency requests for the records center to retain records for more than 1 year after the expiration of their scheduled retention periods should be accompanied by a request to the archivist to revise the disposition instructions on that schedule governing the records.